Added docker-compose and notes for nextcloud

docker/nextcloud/README.md

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+# Nextcloud docker image
+
+## Sources
+
+- [Docker Hub]
+
+[docker hub]: https://hub.docker.com/_/nextcloud

docker/nextcloud/docker-compose.yml

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+version: '3.2'
+
+services:
+  db:
+    image: postgres
+    restart: always
+    volumes:
+      - db:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_DB_FILE=/run/secrets/postgres_db
+      - POSTGRES_USER_FILE=/run/secrets/postgres_user
+      - POSTGRES_PASSWORD_FILE=/run/secrets/postgres_password
+    secrets:
+      - postgres_db
+      - postgres_password
+      - postgres_user
+
+  app:
+    image: nextcloud
+    restart: always
+    ports:
+      - 8080:80
+    volumes:
+      - nextcloud:/var/www/html
+    environment:
+      - POSTGRES_HOST=db
+      - POSTGRES_DB_FILE=/run/secrets/postgres_db
+      - POSTGRES_USER_FILE=/run/secrets/postgres_user
+      - POSTGRES_PASSWORD_FILE=/run/secrets/postgres_password
+      - NEXTCLOUD_ADMIN_PASSWORD_FILE=/run/secrets/nextcloud_admin_password
+      - NEXTCLOUD_ADMIN_USER_FILE=/run/secrets/nextcloud_admin_user
+    depends_on:
+      - db
+    secrets:
+      - nextcloud_admin_password
+      - nextcloud_admin_user
+      - postgres_db
+      - postgres_password
+      - postgres_user
+
+volumes:
+  db:
+  nextcloud:
+
+secrets:
+  nextcloud_admin_password:
+    file: ./nextcloud_admin_password.txt
+  nextcloud_admin_user:
+    file: ./nextcloud_admin_user.txt
+  postgres_db:
+    file: ./postgres_db.txt
+  postgres_password:
+    file: ./postgres_password.txt
+  postgres_user:
+    file: ./postgres_user.txt